Periodic NFC Communication between Reader and I2C Tag

[maxkorb]

Hello I have this rather specific use case, where I use a NFC reader to exchange periodic information, about every 10ms between an I2C Tag and the Reader, for this i write/read the SRAM of the Tag in Mirrored Mode, this communication can't be longer than 2ms at most.

The problem i'm facing is i have to turn off the RF Field between communications, and every time i turn off the field i have to do the whole anticollision loop again which takes roughly 5ms, which for my use case is too long.

Now my question, is it possible to communicate with the Tag without this anticollision loop, and if so how would you do that?

Hardware used is a:

NTAG I2C Plus 2K

[danielchen]

Hi Maxkorb:

NTAG I2C Plus is a state machine based IC. From below state diagram you can see that full anticollision procedure needs to be followed that tag enters ACTIVE state, where it can accept other commands than REAQ, WUPA, SEL_CL1, SEL_CL2.

Sorry, there is no way to skip anticollision process on NTAG I2C plus. (but on NTAG 21X it is possible to skip one part).

Regards

Daniel

[maxkorb]

Thank you i for this info.

I took a look at this NTAG 21X, but i seems like it has no way to communicate with an microcontroller inform of a wired connection. Which i would need.